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患儿,女,2岁。患“急性支气管炎”3天,咳嗽、咳痰加重,体检见患儿痰液粘稠不易咳出,喉部有痰鸣音。清理患儿呼吸道首先应选用
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____________ contracts are agreements by two parties to engage in a financial transaction at a future point in time.
_______________are contracts that give the purchaser the right to buy or sell the underlying financial instrument at a specified price within a specific period of time.
A/An _____________ can be exercised at any time up to the expiration date of the contract.
The term “___________________” in financial markets refers to any instrument or contract that derives its value from another underlying asset, instruments or contracts.
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